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Unformatted text preview: 33. The volume Vcav of the cavities is the diﬀerence between the volume Vcast of the casting as a whole and
the volume Viron contained: Vcav = Vcast − Viron . The volume of the iron is given by Viron = W/gρiron ,
where W is the weight of the casting and ρiron is the density of iron. The eﬀective weight in water (of
density ρw ) is Weﬀ = W − gρw Vcast . Thus, Vcast = (W − Weﬀ )/gρw and
= W − Weﬀ
6000 N − 4000 N
(9.8 m/s2 )(1000 kg/m3 ) (9.8 m/s2 )(7.87 × 103 kg/m3 )
0.126 m3 . ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.
- Fall '08